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What is the molecular weight of a volatile liquid, if .50 g of the liquid fills a 100 mL flask as a gas at 25 degrees C and 1.0 atm pressure?
a) 61
b) 122
c) 230
d) 352
e) 760
A 28.5 g sample of an unknown metal is heated to 95.0C and then dropped into 58.0 g of water in a coffee-cup calorimeter. The temperature of the water rises from 23.5 C to 27.1C.
Calculate Ka for acetic acid in both the molal and molar standard states. Use as many sig figs as your calculations in part b.) warrant.
An element crystallizes in a face-centered cubic lattice. The edge of the unit cell is 392 pm, and the density of the crystal is 21.45 g/cm3. Calculate the atomic weight of the element (in g/mol)
The disinfectant hydrogen peroxide (H2O2) decomposes to form water and oxygen gas.How much O2 will result from the decomposition of 3.21 mol of hydrogen peroxide?Answer in units of mol.
Explain in gory detail the relationship between temperature and vapor pressure. Lots of pictures might be helpful. Why does water expand when it freezes?
What mole ratio of sodium acetate to acetic acid, pKa = 4.74, should be used in preparing a buffer solution having a pH of 4.35
why is a stemless funnel recommended for filtration of the hot saturated solution? 2. in your buchner funnel, can you use filter paper that is to big for the funnel and curls up around the edges? why?
Lethality of Carbon Monoxide, Sulfur Dioxide and TNT Air monitoring provides the following contaminant concentrations at the approximate center of a fire scene in which acres of automobile tires are burning:
Not more than 5 H-bond donors (OH or NH) Not more than 10 H-bond acceptors (O or N) MW less than 500 g/mol What is the rational for the Rule of Five?
Calculate the mass of ethylene glycol, C2H6O2 , that must be added to 1.000 kg of ethanol, C2H5OH, to reduce its vapor pressure by 13.2 torr at 35°C. The vapour pressure of pure ethanol at 35°C is 1.00 x 10 -2 torr.
A buffer solutions contains .120 M acetic acid and 0.150 M sodium acetate. How many moles of acetic acid and of sodium acetate are present in 50.0 ml of solution ? = 0.0075 moles.
Determine the pH, percent ionization and all of the equilibrium concentrations for each of the following.
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